linux-kernel - [PATCH 0/5] Fix rhashtable bit-locking for m68k

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Message-ID: <155503371949.17793.8266195008003399968.stgit@noble.brown>
Date:   Fri, 12 Apr 2019 11:52:07 +1000
From:   NeilBrown <neilb@...e.com>
To:     Thomas Graf <tgraf@...g.ch>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 0/5] Fix rhashtable bit-locking for m68k

As reported by Guenter Roeck, the new rhashtable bit-locking
doesn't work on m68k as it only requires 2-byte alignment, so BIT(1)
is addresses is not unused.

We current use BIT(0) to identify a NULLS marker, but that is only
needed in ->next pointers.  The bucket head does not need a NULLS
marker, so the lsb there can be used for locking.

the first 4 patches make some small improvements and re-arrange some
code.  The final patch converts to using only BIT(0) for these two
different special purposes.

I had previously suggested dropping the series until I fix it.  Given
that this was fairly easy, I retract that I think it best simply to
add these patches to fix the code.

Thanks,
NeilBrown

---

NeilBrown (5):
      rhashtable: fix some __rcu annotation errors
      rhashtable: reorder some inline functions and macros.
      rhashtable: move dereference inside rht_ptr()
      rhashtable: replace rht_ptr_locked() with rht_assign_locked()
      rhashtable: use BIT(0) for locking.

 include/linux/rhashtable.h |  226 +++++++++++++++++++++++++-------------------
 lib/rhashtable.c           |   24 ++---
 lib/test_rhashtable.c      |    2 
 3 files changed, 142 insertions(+), 110 deletions(-)

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